When you ask "What number is halfway between 10 and 665?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=10 and Y=665.
To find the number halfway between 10 and 665, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 665 into our formula, we get:
(10 + 665)/2 = 337.5
Thus, the number halfway between 10 and 665 is 337.5.
To check that our answer is correct, we subtract 10 from 337.5 and subtract 337.5 from 665 and compare the two numbers:
337.5 - 10 = 327.5
665 - 337.5 = 327.5
As you can see, the halfway number is 327.5 higher than 10 and 327.5 lower than 665. Therefore, our halfway between answer of 337.5 above is correct.
Halfway Between
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Halfway Between 10 and 666
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